footer{
    box-shadow: 0 0 1px #ccc;
    position: fixed;
    left:50%;
    transform: translateX(-50%);
    bottom: 0;
    min-width: 320px;
    max-width: 750px;
    width: 100%;
    height: 1.333333rem;
    background-color: #fff;
    z-index: 1;
    display: flex;
    .item{
        flex:1;
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        font-size: .24rem;
        color: #999;
        i{
            display: block;
            width: .426667rem;
            height: .426667rem;
            background:url(../images/底部菜单/课程-未选中.png) no-repeat;
            background-size: .4rem .426667rem;
        }
        &:first-child{
            color: #6582ff;
            i{
                display: block;
                width: .426667rem;
                height: .426667rem;
                background:url(../images/底部菜单/课程-选中.png) no-repeat;
                background-size: .4rem .426667rem;
            }
        }
        
    }
}